COMPMID-1023: Import memory for OpenCL

Change-Id: I201bc00a1261814737e6b6878ecfe9904bae0cc1
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/128212
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/arm_compute/runtime/CL/CLBufferAllocator.h b/arm_compute/runtime/CL/CLBufferAllocator.h
index 05b0363..19a3e62 100644
--- a/arm_compute/runtime/CL/CLBufferAllocator.h
+++ b/arm_compute/runtime/CL/CLBufferAllocator.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -34,7 +34,7 @@
 namespace arm_compute
 {
 /** Default OpenCL cl buffer allocator implementation */
-class CLBufferAllocator : public IAllocator
+class CLBufferAllocator final : public IAllocator
 {
 public:
     /** Default constructor */
@@ -43,6 +43,7 @@
     // Inherited methods overridden:
     void *allocate(size_t size, size_t alignment) override;
     void free(void *ptr) override;
+    std::unique_ptr<IMemoryRegion> make_region(size_t size, size_t alignment) override;
 
 private:
     cl::Context _context;